未处理的JS异常：_this2.setState不是函数

Question

我在密码输入中遇到了onChangeText问题。我想要做什么的详细说明：我想最初禁用提交按钮，当两个输入字段填充后启用提交按钮。如果您有其他方法可以解决此问题，请分享。对于onChangeInput

<InputGroup style={styles.inputBox}> 
         <Icon name='ios-person' style={{color: 'white'}}/> 
         <Input placeholder='Email' style={styles.input} 
           placeholderTextColor='rgba(255, 255, 255, 0.6)' 
           value={this.state.username} 
           onChangeText={(text) => this.setState({username: text})} 
           onChange={this.onInputChange} /> 
        </InputGroup> 
        <InputGroup style={styles.inputBox}> 
         <Icon name='ios-unlock' style={{color: 'white'}}/> 
         <Input placeholder='Password' style={styles.input} 
           secureTextEntry={true} 
           placeholderTextColor='rgba(255, 255, 255, 0.6)' 
           value={this.state.password} 
           onChangeText={(text) => this.setState({password: text})} 
           onChange={this.onInputChange} /> 
        </InputGroup> 
        <Button block bordered success style={styles.submitButton} onPress={this.onSignIn} disabled={this.state.submitButtonFlag}> 
         Sign In 
        </Button> 

代码：

onInputChange() { 

    if (this.state.username != null && this.state.password != null) { 
    console.log("this.state.submitButtonFlag: "); 
    this.setState = {submitButtonFlag: false}; 
    console.log(this.state.submitButtonFlag); 
    } 

} 

Answer 1

两个错误：

1. 参考与正确此范围：onChange={() => this.onInputChange()} />

2. 的setState是一个函数：this.setState({submitButtonFlag: false});